I recently replaced the hood liner on my '89 420 SEL. The new liner from the dealer was $55 and completely different from the original. The new one is a 3/4 thick foam with a honeycomb square pattern, whereas the original was just a cheap thin insulation. It actually looks a lot like those closed foam camping mattresses that roll up. I glued it with a tube of 3M weatherstrip adhesive which has held up just fine.